Benji Dunn: Join the IMF and see the world. On a screen. From a closet.
Ethan Hunt: The Syndicate is real. A rogue nation, trained to do what we do.
Benji Dunn: An anti-IMF.
Benji Dunn: Let me guess. Presumed dead?
Ethan Hunt: Well tonight, I just made it official.
Answer: It's a highly-miniaturized camera and transmitter. The lens cam only transmits video - the verbal communication is via an earpiece with a microphone Benji is also wearing. There is no speaker, Benji hears what Lane is saying on the earpiece and says it to Ethan.